US2835617A - Composition and method for coating metallic surfaces - Google Patents

Composition and method for coating metallic surfaces Download PDF

Info

Publication number
US2835617A
US2835617A US484310A US48431055A US2835617A US 2835617 A US2835617 A US 2835617A US 484310 A US484310 A US 484310A US 48431055 A US48431055 A US 48431055A US 2835617 A US2835617 A US 2835617A
Authority
US
United States
Prior art keywords
ion
zinc
phosphate
coating
proportion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US484310A
Other languages
English (en)
Inventor
James I Maurer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Parker Rust Proof Co
Original Assignee
Parker Rust Proof Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DENDAT1065246D priority Critical patent/DE1065246B/de
Priority to BE544622D priority patent/BE544622A/xx
Application filed by Parker Rust Proof Co filed Critical Parker Rust Proof Co
Priority to US484310A priority patent/US2835617A/en
Priority to FR1147987D priority patent/FR1147987A/fr
Priority to CH339024D priority patent/CH339024A/fr
Application granted granted Critical
Publication of US2835617A publication Critical patent/US2835617A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
    • C23C22/36—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also phosphates

Definitions

  • the present invention relates to improved solutions for, and to an improved method of, coating the surfaces of zinc-coated steel and iron to provide thereon an adherent, corrosion-resistant coating suitable as a base for protective finishing materials such as paint, lacquer, varnish, enamel, etc. More specifically, the invention relates to improved phosphate coating solutions and to an improved method of coating the surfaces of zinc-coated iron and steel made by certain continuous commercial hot-dipping processes to provide smoother, more satisfactory coatings and to a method which is more satisfactory under the operating conditions prevailing in such processes.
  • U. S. Patent No. 1,221,046 discloses the coating of zinc and its alloys by treatment with a solution of phosphoric acid containing a nitrate accelerator.
  • the latter patent and U. S. Patent No. 2,121,574 allege that more uniform phosphate coatings are obtained when nickel or cobalt ions are added to the phosphoric acid solution.
  • U. S. Patents 1,869,121 and 1,888,189 disclose that copper ion in certain concentrations is beneficial in speeding up the action of a phosphate solution on a zinc surface.
  • the surfaces of certain zinc alloys containing aluminum, which are coated only with great diificulty in nickel-accelerated phosphate solutions, are said in U.
  • phosphate coating solutions containing nickel ion and a small proportion of soluble silicon preferably as the silicofluoride ion are capable of producing heavy, uniform, adherent phosphate coatings substantially free of seediness on theabove-mentioned types of continuous, hot-dipped zinc coated iron and steel.
  • the phosphate solutions of this invention comprise phosphate (P0 ion, an ion such as zinc and manganese in sufficient proportion to produce a dihydrogen phosphate with the (P0 ion, a small proportion of nickel ion, a small proportion of soluble silicon preferably intro pokerd as a silicon-containing ion such as the silicotluoride (SiF ion, and an oxidant such as nitrite or nitrate ions.
  • the solution may contain a small proportion of coopper as an additional accelerator, if desired.
  • the term continuous hot-dipped, zinc-coated ferrous surface is intended to include any iron, steel or other ferrous surface which has been provided with a zinc coating by the continuous method of U. S. Patent 2,197,622 or other hot-dipping methods which produce zinc coatings which aquire a seedy phosphate coating in known phosphate coating solutions.
  • U. S. Patent No. 2,197,622 for applying a zinc coating on ferrous surface comprises the steps of oxidizing the ferrous surface to form a thin oxide film thereon having a color ranging from light yellow to purple and ranging as far as gray, then reducing the oxide film to a film of the pure metal and while the reduced film remains protected in a non-oxidizing atmosphere the surface, in a flux-free condition, is immersed in a molten zinc bath containing a minor quantity of aluminum to thereby form a zinc coating when the surface is withdrawn from the bath and allowed to cool.
  • the phosphate coating solutions which are improved by the addition of the combinations of nickel and siliconcontaining ions contain as the essential coating-producing ingredients about 0.5 to 2.5% (W./vol.) P0 ion, at least sufficient zinc or manganese to form dihydrogen phosphate with the phosphate ion, and a suitable amount of an oxidizing ion such as the nitrate or nitrite ion or a mixture of nitrate and nitrite ions.
  • the quantity of nitrate ion which is desirable is about 0.2 to about 1% with major benefits being obtained at about 0.3 to 0.5% N0 Where nitrite is used, substantially smaller quantitles are required to produce acceleration and about 0.0002 to 0.008% N0 may be utilized.
  • soluble silicon is noticeably effective in reducing the number of seeds or raised spots.
  • a bath containing less than about 0.4 to 0.5% zinc or manganese, less than about 0.5% nitrate ion, or less than about 0.005 nitrite ion it is also preferable to utilize baths of this type which have a total acidity of less than 40 points (see Example 1 for method of determining total acidity) and a ratio of PO, ion to zinc or manganese ion of not more than 5:1.
  • the nickel and copper ions can be provided'by adding a salt which is soluble in the solution, for example, a carbonate, nitrate, chloride or sulfate.
  • a salt which is soluble in the solution for example, a carbonate, nitrate, chloride or sulfate.
  • the soluble silicon is added to the solution in the form of an acid such as hydrofiuosilicic acid or a static soluble sat such as the silicofluoride salts 'of sodium, potassium and ammonium.
  • the concentration of soluble silicon required for smooth, hard, and spot-freeouseed-free:phosp-hate coatings is very small. When aslittle as 0.03% of silicon is added, as sodium silicofiuoride, the tendency to form seedy coatings is greatly reduced. However, with proportions less than 0.03% silicon, the number of spots sometimes is reduced but their size is increased. When more than 0.03% is utilized both the number and size of the spots are significantly reduced. In general, the proportion of silicon required for seed-free or substantially seed-free coatings increases as the acivity of the solution is increased, that is, as the concentration of zinc or manganese, nickel, copper, oxidant and the total and free acid content of the solution increases.
  • the solutions of this invention containing the combination of nickel, copper and silicon in the ranges of concentration given above form hard, adherent, uniform and seed-free coatings on the particular types of hot-dipped, zinc-coated ferrous surfaces described above.
  • the coatings produced have excellent resistance to corrosion and have excellent adherence properties for paints, lacquers, enamels, varnishes, and other protective coatings.
  • the solutions of this invention can be utilized as an adjunct to the above-mentioned high speed hot dip zinc coating processes wherein sheet iron or steel in continuous strips are fed at high speeds successively through rolling mills, zinc coating stages and finally through the phosphate coating process.
  • the solutions can be applied by immersion, spraying or any other suitable method. Bath temperatures required will usually vary between 130 and 180 F., with 130 to 160 F. being preferred.
  • Example I A separate make-up and a separate replenisher solu ion were built up containing the following materials:
  • the total acidity given above is the ml. of N/ 10 NaOH (points) determined by titrating a 10 ml. sample with N/ 10 sodium hydroxide to a phenolphthalein end-point whereas the free acidity is the ml. of N/10 sodium hydroxide (points) required to neutralize a 10 m1. sample to a bromophenol blue end point.
  • the diluted, 35.5 as. make-up solution was placed in va tank and heated to about to 180 F.
  • these coated panels were painted with the usual primer and finish coats the finished stock showed excellent adherence of the paint, good corrosion resistance and an appearance entirely acceptable for commercial usage.
  • similar hotdipped zinc coated steel panels were coated in a bath similar to that of this example, except for the substitution of approximately equivalent amounts of hydrofluoric acid or hydrofiuo'boric acid, the phosphate coatings were obiectionably seedy. it is clear, therefore, that it was the soluble silicon and not the fluoride content that eliminated the seediness.
  • the make-up and replenisher solutions described in Example 1, above, are formulated so as to contain a balanced proportion of the ingredients and as high a total solids content as will not precipitate or crystallize out at 0 F.
  • a dilution ratio of at least 1:1 is considered necessary for economy in shipping. Dilution ratios of at least 5, 10 or 15:1 or more are preferred.
  • the concentrations of the ingredients are a simple multiple of the concentration of a working bath.
  • the various ingredients are present in the ratio in which they are used up or removed from an operating bath. For example, the free acidity of the replenisher is higher than that of the make-up in order to maintain the free acidity of the operating bath.
  • the phosphoric acid and zinc oxide which are the principal coating-producing agents, are present in a higher proportion in the rcplenisher than in the make-up for the same reason.
  • these ingredients are combined in such high concentrations there is a tendency to form a precipitate, even at room temperature. This tendency is effectively overcome by the addition of sufficient excess hydrofluoric acid. For this purpose, only about 0.1 to 0.3% or more is required.
  • hydrofluoric acid When stabilized with hydrofluoric acid these solutions can be stored or shipped Without special precaution and can be diluted with water to form excellent operating solutions.
  • the replenisher is preferably added to the operating bath as is.
  • Example 2 A nickel activated bath having the following composition was employed to treat hot-dipped steel sheet:
  • H PO Grams/liter Phosphoric acid, H PO (75%) 13.7 Nitric acid, HNO (32 B.) 3.6 Zinc oxide, ZnO 3.1 Nickel carbonate, NiCO 4.6 Boric acid, H BO 1.8
  • An aqueous solution for coating a continuous hotdipped, zinc-coated ferrous surface comprising as the essential coating-producing ingredients about 0.5% to 2.5% phosphate ion, a metal ion of the group consisting of the zinc ion and the manganese ion in a proportion at least sufficient to form dihydrogen phosphate with said phosphate ion, 0.01 to 0.4% nickel ion, at least one oxidizing ion from the group consisting of the nitrate ion and the nitrite ion in a concentration of about 0.2 to 1% nitrate ion and 0.0002% to 0.008% nitrite ion, and a silicon-containing ion in a proportion suflicient to produce at least 0.03% soluble silicon.
  • An aqueous solution for coating a continuous hotdipped, zinc-coated ferrous surface consisting essentially of about 0.5% to 2.5 phosphate ion, a metal ion of the group consisting of the zinc ion and the manganese ion in a proportion at least sufficient to form dihydrogen phosphate with said phosphate ion, 0.01 to 0.4% nickel ion, at least one oxidizing ion selected from the group consisting of the nitrate ion and the nitrite ion in a concentration of about 0.2% to 1% nitrate ion and 0.0002% to 0.008% nitrite ion, and silicofluoride ion in a proportion sufiicient to produce at least 0.03% soluble silicon.
  • An aqueous solution for coating a continuous hotdipped, zinc-coated steel surface consisting essentially of 0.5% to 2.5 phosphate ion, zinc ion in a proportion from that suflicient to form dihydrogen phosphate with said phosphate ion, to not more than 0.5%, a ratio of phosphate ion to zinc ion of not more than 5:1, 0.01 to 0.4% nickel ion, 0.2% to 0.5% nitrate ion, and silicofluoride ion sufiicient to produce at least 0.03% soluble silicon.
  • the method of providing seed-free phosphate coatings on continuous hot-dipped, zinc-coated ferrous surfaces comprising contacting the said surfaces with an aqueous solution comprising as the essential coating-producing ingredients about 0.5 to 2.5% phosphate ion, a metal ion of the group consisting of the zinc ion and the manganese ion in a proportion at least sufficient to form dihydrogen phosphate with said phosphate ion, 0.01 to 0.4% nickel ion, at least one oxidizing ion from the group consisting of the nitrate ion and the nitrite ion in a concentration of about 0.2 to 1% nitrate ion and 0.0002 to 0.008% nitrite ion, and a silicon-containing ion in a proportion sufiicient to produce at least 0.03% soluble silicon.
  • an aqueous solution comprising as the essential coating-producing ingredients about 0.5 to 2.5% phosphate ion, a metal ion of the
  • the method of providing seed-free phosphate coatings on continuous hot-dipped, zinc-coated steel surfaces comprising contacting the said surfaces with an aqueous solution consisting essentially of 0.5 to 2.5 phosphate ion, zinc ion in a proportion selected from the range from that at least sufficient to form dihydrogen phosphate with said phosphate ion to not more than 0.5 a ratio of phosphate ion to zinc ion of not more than 5:1, 0.01 to 0.4% nickel ion, 0.2 to 0.5% nitrate ion, and silicofluoride ion suflicient to produce at least 0.03% soluble silicon.
  • the method of providing seed-free phosphate coatings on continuous hot-dipped, zinc-coated steel surfaces comprising contacting the said surface with an aqueous solution containing as the essential coating-producing ingredients about 0.5% to 2.5% phosphate ion, a metal ion of the group consisting of the zinc ion and the manganese ion in a proportion at least sufiicient to form dihydrogen phosphate with said phosphate ion, 0.01 to 0.4% nickel ion, at least one oxidizing ion selected from the group consisting of the nitrate ion and the nitrite ion in a concentration of about 0.2% to 1% nitrate ion and 0.0002% to 0.008% nitrite ion, and silicofluoride ion in a proportion sufficient to produce at least 0.03% soluble silicon.
  • An aqueous solution for coating hot-dipped, zinccoated ferrous surfaces containing as the essential coatingproducing ingredients about 0.5% to 2.5 phosphate ion, a metal ion of the group consisting of the zinc ion and the manganese ion in a proportion at least sufficient to form dihydrogen phosphate with said phosphate ion, 0.01 to 0.4% nickel ion, 0.0003 to 0.005% copper ion, at least one oxidizing ion selected from the group consisting of the nitrate ion and the nitrite ion in a concentration of about 0.2% to 1% nitrate ion and 0.0002% to 0.008% nitrite ion, and silicofluoride ion in a proportion sufficient to produce at least 0.03% soluble silicon.
  • the method of providing seed-free phosphate coat-v ings on continuous hot-dipped, zinc-coated steel surfaces comprising contacting the said surface with an aqueous solution containing as the essential coating-producing ingredients about 0.5% to 2.5% phosphate ion, a metal ion of the group consisting of the zinc ion and the manganese ion in a proportion at least sufficient to form dihydrogen phosphate with said phosphate ion, 0.01 to 0.4% nickel ion, 0.0003 to 0.005 copper ion, at least one oxidizing ion selected from the group consisting of the nitrate ion and the nitrite ion in a concentration of about 0.2% to 1% nitrate ion and 0.0002% to 0.008% nitrite ion, and silicofluoride ion in a proportion sufiicient to produce at least 0.03% soluble silicon.

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
US484310A 1955-01-26 1955-01-26 Composition and method for coating metallic surfaces Expired - Lifetime US2835617A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DENDAT1065246D DE1065246B (de) 1955-01-26 Verfahren zur Herstellung von Phosphatüberzügen auf feuerverzinken eisernen Oberflächen
BE544622D BE544622A (en:Method) 1955-01-26
US484310A US2835617A (en) 1955-01-26 1955-01-26 Composition and method for coating metallic surfaces
FR1147987D FR1147987A (fr) 1955-01-26 1956-01-20 Composition et procédé perfectionnés pour le revêtement de surfaces métalliques
CH339024D CH339024A (fr) 1955-01-26 1956-01-21 Procédé et solution pour l'obtention de revêtements phosphatés sur des surfaces ferreuses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US484310A US2835617A (en) 1955-01-26 1955-01-26 Composition and method for coating metallic surfaces

Publications (1)

Publication Number Publication Date
US2835617A true US2835617A (en) 1958-05-20

Family

ID=23923623

Family Applications (1)

Application Number Title Priority Date Filing Date
US484310A Expired - Lifetime US2835617A (en) 1955-01-26 1955-01-26 Composition and method for coating metallic surfaces

Country Status (5)

Country Link
US (1) US2835617A (en:Method)
BE (1) BE544622A (en:Method)
CH (1) CH339024A (en:Method)
DE (1) DE1065246B (en:Method)
FR (1) FR1147987A (en:Method)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3240633A (en) * 1962-06-04 1966-03-15 Hooker Chemical Corp Method of forming phosphate coating on zinc
US3269876A (en) * 1962-12-13 1966-08-30 Rheem Mfg Co Glass-coated steel article
US3459600A (en) * 1966-11-07 1969-08-05 Todco Chem Co Inc Novel zinc coating composition and method
US3642541A (en) * 1969-02-12 1972-02-15 Republic Steel Corp Method for applying corrosion-resistant composite coating to ferrous metals and product resulting therefrom
US4110128A (en) * 1975-12-17 1978-08-29 International Lead Zinc Research Organization, Inc. Solution and procedure for depositing a protective coating on galvanized steel parts, and solution regeneration procedure
US4110127A (en) * 1974-01-23 1978-08-29 International Lead Zinc Research Organization, Inc. Procedure for depositing a protective precoating on surfaces of zinc-coated ferrous metal parts against corrosion in presence of water
DE3234558A1 (de) * 1981-09-17 1983-04-07 Amchem Products, Inc., 19002 Ambler, Pa. Waessrig-saure zinkphosphat-ueberzugsloesungen, solche loesungen verwendende tieftemperatur-verfahren zur bildung chemischer umwandlungsueberzuege auf eisen- und/oder zinkoberflaechen und darin verwendbare ueberzugskonzentrate und titanhaltige metallaktivierende loesungen
US4595424A (en) * 1985-08-26 1986-06-17 Parker Chemical Company Method of forming phosphate coating on zinc
US4681641A (en) * 1982-07-12 1987-07-21 Ford Motor Company Alkaline resistant phosphate conversion coatings
US5082511A (en) * 1989-09-07 1992-01-21 Henkel Corporation Protective coating processes for zinc coated steel
USRE35958E (en) * 1985-08-26 1998-11-17 Henkel Corporation Method of forming phosphate coating on zinc

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL271405A (en:Method) 1960-11-16

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE606109C (de) * 1933-10-12 1934-11-24 Metallgesellschaft Ag Verfahren zur Herstellung von rostschuetzenden Phosphatueberzuegen auf eisernen Gegenstaenden
US2121574A (en) * 1936-11-30 1938-06-21 American Chem Paint Co Art of coating zinc
US2312855A (en) * 1940-09-07 1943-03-02 Parker Rust Proof Co Method of coating aluminum
GB655079A (en) * 1946-09-11 1951-07-11 Pyrene Co Ltd Improvements in or relating to the production of phosphate coatings
US2591479A (en) * 1947-05-12 1952-04-01 Parker Rust Proof Co Method of and solution for coating surfaces chiefly of zinc

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE606109C (de) * 1933-10-12 1934-11-24 Metallgesellschaft Ag Verfahren zur Herstellung von rostschuetzenden Phosphatueberzuegen auf eisernen Gegenstaenden
US2121574A (en) * 1936-11-30 1938-06-21 American Chem Paint Co Art of coating zinc
US2312855A (en) * 1940-09-07 1943-03-02 Parker Rust Proof Co Method of coating aluminum
GB655079A (en) * 1946-09-11 1951-07-11 Pyrene Co Ltd Improvements in or relating to the production of phosphate coatings
US2591479A (en) * 1947-05-12 1952-04-01 Parker Rust Proof Co Method of and solution for coating surfaces chiefly of zinc

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3240633A (en) * 1962-06-04 1966-03-15 Hooker Chemical Corp Method of forming phosphate coating on zinc
US3269876A (en) * 1962-12-13 1966-08-30 Rheem Mfg Co Glass-coated steel article
US3459600A (en) * 1966-11-07 1969-08-05 Todco Chem Co Inc Novel zinc coating composition and method
US3642541A (en) * 1969-02-12 1972-02-15 Republic Steel Corp Method for applying corrosion-resistant composite coating to ferrous metals and product resulting therefrom
US4110127A (en) * 1974-01-23 1978-08-29 International Lead Zinc Research Organization, Inc. Procedure for depositing a protective precoating on surfaces of zinc-coated ferrous metal parts against corrosion in presence of water
US4126469A (en) * 1974-01-23 1978-11-21 International Lead Zinc Research Organization, Inc. Solution and procedure for depositing a protective precoating on surfaces of zinc-coated ferrous metal parts against corrosion in presence of water
US4110128A (en) * 1975-12-17 1978-08-29 International Lead Zinc Research Organization, Inc. Solution and procedure for depositing a protective coating on galvanized steel parts, and solution regeneration procedure
DE3234558A1 (de) * 1981-09-17 1983-04-07 Amchem Products, Inc., 19002 Ambler, Pa. Waessrig-saure zinkphosphat-ueberzugsloesungen, solche loesungen verwendende tieftemperatur-verfahren zur bildung chemischer umwandlungsueberzuege auf eisen- und/oder zinkoberflaechen und darin verwendbare ueberzugskonzentrate und titanhaltige metallaktivierende loesungen
US4681641A (en) * 1982-07-12 1987-07-21 Ford Motor Company Alkaline resistant phosphate conversion coatings
US4595424A (en) * 1985-08-26 1986-06-17 Parker Chemical Company Method of forming phosphate coating on zinc
USRE35958E (en) * 1985-08-26 1998-11-17 Henkel Corporation Method of forming phosphate coating on zinc
US5082511A (en) * 1989-09-07 1992-01-21 Henkel Corporation Protective coating processes for zinc coated steel

Also Published As

Publication number Publication date
BE544622A (en:Method)
DE1065246B (de) 1959-09-10
FR1147987A (fr) 1957-12-02
CH339024A (fr) 1959-06-15

Similar Documents

Publication Publication Date Title
US4865653A (en) Zinc phosphate coating process
US4961794A (en) Phosphate coatings for metal surfaces
US4148670A (en) Coating solution for metal surface
US2796370A (en) Composition and method for producing corrosion resistant protective coating on aluminum and aluminum alloys
US4311535A (en) Composition for forming zinc phosphate coating over metal surface
US4419199A (en) Process for phosphatizing metals
US3619300A (en) Phosphate conversion coating of aluminum, zinc or iron
US2106904A (en) Coating malleable non-noble heavy metals
WO1993003198A1 (en) Zinc phosphate conversion coating composition and process
US2835617A (en) Composition and method for coating metallic surfaces
US4486241A (en) Composition and process for treating steel
EP0228151B1 (en) Acidic, aqueous phosphate-coating solutions for use in a process for phosphate-coating metal surfaces
CA1308338C (en) Process of producing phosphate coatings on metal surfaces
US2665231A (en) Coating process with alkali metal phosphate and added fluoride salt
US2813812A (en) Method for coating iron or zinc with phosphate composition and aqueous solution therefor
US6261384B1 (en) Process and aqueous solution for phosphatizing metallic surfaces
JPH0465151B2 (en:Method)
US3895969A (en) Composition and process for inhibiting corrosion of non-ferrous metal surfaced articles and providing surface for synthetic resin coating compositions
US3338755A (en) Production of phosphate coatings on metals
US3459600A (en) Novel zinc coating composition and method
JPH04341574A (ja) 金属表面のリン酸亜鉛処理方法
US5234509A (en) Cold deformation process employing improved lubrication coating
EP0904425B1 (en) Moderate temperature manganese phosphate conversion coating composition and process
US3146133A (en) Process and compositions for forming improved phosphate coatings on metallic surfaces
US2791525A (en) Composition for and method of forming oxalate coatings on ferrous metal surfaces